As usual, a well-thought-out example is the best.
I agree with what you said.
Skip
----- Original Message ---------------
Subject: [OM] Re: Great E-1 150/2.0 pix on dpreview.com
From: hiwayman@xxxxxxx (Walt Wayman)
Date: Thu, 02 Dec 2004 21:34:54 +0000
To: olympus@xxxxxxxxxx
>One more time:
>
>Let us take a hypothetical 180mm lens, one that will cover the 8x10 in.
>format, and let us assume we can attach it to a 6x9cm camera, which would be
>no problem, and to a 35mm camera, which might require some duct tape and an
>empty soup can. Now, let us very carefully focus and center all three cameras
>with this lens on a Prince Albert tin about 30 feet away in my front yard.
>
>On the 8x10 camera, this is a wide angle lens, so not only will we get a
>picture of Prince Albert, but we'll maybe get the OM-4Runner in the driveway,
>the neighbor lady in her bathrobe coming out to get her morning paper (if
>we're not too early), our mailbox, part of the fence across the street, and
>all of the front sidewalk and the hemlocks beside it.
>
>With the same lens on the 6x9 camera, we'll miss the neighbor lady (with any
>luck, she's come over by now to see what's going on -- she really likes me,
>you know), and we're probably not getting the OM-4Runner or the mailbox, but a
>fair amount of the sidewalk and the bottom of the hemlocks.
>
>Same lens on the 35mm gets the can and a bit of background grass, but not much
>else. After all, 180mm is a telephoto lens on this format.
>
>Now, if we cut a 6x9cm section out of the 8x10 in. negative, it's going to be
>identical to the 6x9 negative. Then if we cut a 24x36mm section out of both
>the 8x10 and the 6x9, they'll each be identical to the 35mm negative. They're
>all going to have the same DOF, same perspective, same everything, because
>they were all -- anyone? anyone? -- shot with the same ****ing focal length
>lens!
>
>I don't think I can explain it any more better. Jeez, just when you need him,
>Ansel's dead.
>
>Walt
>
>--
>"Anything more than 500 yards from
>the car just isn't photogenic." --
>Edward Weston
>
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